Axelrodi Rasbora

The axelrodi rasbora is a tiny species, only 2 cm long, that lives in the peat swamps of Indonesia. The males' back shines blue-green as it catches the light; the belly and fins show reddish-orange tones. Colors vary markedly between populations. Since several similar-looking Sundadanio species have been described, some of the fish sold under this name may be different species. It is closely tied to blackwater conditions and does not live long in hard water.

• At least 25 liters for a group of 10–15; a mature aquarium with biofilm.
• 24–27°C, pH 5–6.5, very soft water; reverse osmosis or rainwater may be needed.
• A dim, tannin-stained setup with dried leaves, roots, moss and floating plants.
• Very weak flow; a sponge filter is ideal.

It is a micropredator. It prefers small live or frozen foods such as newly hatched brine shrimp, cyclops and microworms; it may accept micro granules over time. Feed little and often.

Peaceful and shy. It moves in a loose group among the plants; males display to each other by flaring their fins.

Good companions: Boraras species, glowlight rasboras, Caridina shrimp, dwarf corydoras species, small fish that want the same blackwater conditions.

Avoid: active and large species, fish that need hard water, any species with a mouth big enough to swallow it.